staging: wilc1000: join_req_drv can be static

Signed-off-by: NFengguang Wu <fengguang.wu@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/host_interface.c

@@ -261,7 +261,7 @@ static u8 mode_11i;
 u8 auth_type;
 u32 join_req_size;
 static u32 info_element_size;
-struct host_if_drv *join_req_drv;
+static struct host_if_drv *join_req_drv;
 #define REAL_JOIN_REQ 0
 #define FLUSHED_JOIN_REQ 1
 #define FLUSHED_BYTE_POS 79